CN102709895A - Transformer DC (Direct Current) bias magnetic suppression device - Google Patents
Transformer DC (Direct Current) bias magnetic suppression device Download PDFInfo
- Publication number
- CN102709895A CN102709895A CN2012102158580A CN201210215858A CN102709895A CN 102709895 A CN102709895 A CN 102709895A CN 2012102158580 A CN2012102158580 A CN 2012102158580A CN 201210215858 A CN201210215858 A CN 201210215858A CN 102709895 A CN102709895 A CN 102709895A
- Authority
- CN
- China
- Prior art keywords
- transformer
- parallel
- current transformer
- switch
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a transformer DC (Direct Current) bias magnetic suppression device which comprises a group of capacitors which are connected in parallel. One parallel connection end of the capacitor group is connected in series with a capacitive current transformer ACTA2; the capacitive current transformer ACTA2 is connected with a DC current transformer DCTA and a bypass switch current transformer ACTA1 which are connected in series; voltage transformers TV1 and TV2, a discharging gap and a bypass mechanical switch QF are connected in parallel between the bypass switch current transformer ACTA1 and the other parallel connection end of the capacitor group; both ends of the bypass mechanical switch QF are also connected in parallel with reactors L1 to L3, thyristors T1 to T6 which are respectively connected in series with the reactors L1 to L3 and are reversely connected in parallel and a triggering circuit of the thyristors T1 to T6; and the DC current transformer DCTA, the bypass switch current transformer ACTA1, the voltage transformers TV1 and TV2 and the triggering circuit of the thyristors T1 to T6 are also connected with a measurement and control protection unit. The structure is simplified and the reliability and the intelligence of a system are improved.
Description
Technical field
The present invention relates to a kind of transformer DC magnetic bias restraining device.
Background technology
When DC transmission system adopts the ground return circuit operational mode; The huge direct current that from the earth, flows through fails to be convened for lack of a quorum near AC system is exerted an influence; Particularly can produce more serious D.C. magnetic biasing to the direct grounding transformer of neutral point, the reactive power consumption that this has not only increased transformer influences the normal operation of transformer; Cause protective relaying maloperation; But also can cause that harmonic wave significantly raises, other electric equipments are produced considerable influence, thereby directly have influence on the safe operation in transformer station, power plant.
Increasing along with China's high voltage direct current transmission project; DC transmission engineering one pole one pole the earth operation total time that the maintenance of time and annual DC power transmission line causes of putting into operation is also more and more longer; And the big earthed return operational mode of DC transmission system is as the fault emergency mode; Basically inevitable, therefore, transformer DC magnetic bias suppresses technology and more and more comes into one's own.But existing magnetic bias restraining device needs extra commutating circuit and thyristor turn-off circuit, and comparatively complicated on the structure, reliability is relatively poor.
Summary of the invention
The object of the invention is exactly for addressing the above problem; A kind of transformer DC magnetic bias restraining device is provided; It is rational in infrastructure, owing to do not need extra commutating circuit and thyristor turn-off circuit, the topological structure of major loop is able to a large amount of simplification; Simultaneously because adopted the analog protection circuit of pure hardware and the complete dualization redundancy structure of Microcomputer Protection, improved the reliability of system and intelligent.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of transformer DC magnetic bias restraining device, it comprises the capacitor of one group of parallel connection, a parallel connected end of capacitor group is connected with capacitance current instrument transformer ACTA2; Capacitance current instrument transformer ACTA2 is connected with DC current transformer DCTA, the by-pass switch current transformer ACTA1 of series connection;
Be parallel with voltage transformer TV1, TV2, discharging gap FD, bypass mechanical switch QF between by-pass switch current transformer ACTA1 and another parallel connected end of capacitor group, simultaneously bypass mechanical switch QF two ends also are parallel with reactor L1-L3 and the thyristor T1-T6 and the circuits for triggering thereof of the reverse parallel connection of connecting respectively with reactor L1-L3;
DC current transformer DCTA, by-pass switch current transformer ACTA1, voltage transformer TV1, TV2, thyristor T1-T6 circuits for triggering also are connected with the monitoring and protection unit.
Said DC current transformer DCTA is connected with transformer neutral point earthed switch K1 one end; Parallel connected end of capacitor group is connected with transformer neutral point earthed switch K1 through device switching knife switch K2, and transformer neutral point earthed switch K1 is connected with transformer 220KV side.
The present invention utilizes capacitor stopping direct current, the logical electrical characteristic that exchanges; Between main transformer neutral point and earth electrode, connect behind the installing capacitor; Can eliminate the direct current that flows through transformer neutral point effectively, and the alternating current that does not influence neutral point is through capacitor grounding.Under some improper situation, such as exchanging fault, thunderbolt etc., the main transformer neutral point can flow through very big earth current; And produce the very high transient voltage of amplitude, might damage capacitor, current bypass loop of parallel connection at the capacitor two ends; The electric current that perhaps flows through capacitor when voltage across capacitor is above behind the setting; Electric current passes through bypass protection loop stream mistake, thereby with the capacitor bypass, has limited the transient voltage amplitude at capacitor two ends.
After device was linked into transformer neutral point, in order to influence or do not influence system as far as possible littlely, under the normal state of system, the capacitor of device will be by bypass, the direct ground connection of transformer neutral point.If direct current appears in transformer neutral point, capacitor will drop into automatically; If transformer neutral point bigger short-circuit current occurs or the capacitor terminal voltage raises fast simultaneously in the process that capacitor puts into operation, capacitor can be by bypass, neutral-point solid ground, thus avoid capacitor to damage because of overload.
The beneficial effect of the invention is:
1) is employed in the transformer neutral point series capacitance at a distance from straight solution, constitutes triple bypass protections loop by thyristor, high-speed switch, discharging gap;
2) capacitor is full membrane structure, and the proof voltage grade is high, and capacity is undamped, safety, reliability height;
3) utilize the special-purpose permanent-magnetic switching of capacitor switching to realize the state exchange of direct ground connection and capacitor grounding, speed is fast, capacity is big;
4) under the capacity earth state, when neutral point overvoltage, convert direct ground state into, change-over time, the changing voltage thresholding can pass through the wire jumper setting less than 20uS;
5) under the capacity earth state, neutral point exchanges capacitance to earth less than 1.2 Ω, and relaying protection and other automatics do not need to adjust again;
6) embedded measurement and control unit detects neutral point current or voltage according to different operation states, realizes the running status conversion of automatic or manual; Embedded record ripple unit, the variation of device running status and neutral point current, change in voltage situation when the record electric parameter is out-of-limit are for operating analysis provides foundation.
7) utilize computer remote terminal to realize that a remote monitoring terminal can be monitored multiple arrangement simultaneously to supervision, the control of device.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1, K1 is transformer neutral point earthed switch (an original place cutter), and K2 is device switching knife switch (newly cutter, the client provides for oneself).The device part comprises: capacitor group C1-C24, the thyristor T1-T6 and the circuits for triggering thereof of reverse parallel connection, reactor L1-L3; Bypass mechanical switch QF; Voltage transformer TV1-TV2, by-pass switch current transformer ACTA1, capacitance current instrument transformer ACTA2; DC current transformer DCTA, discharging gap FD and monitoring and protection unit etc.
Device has three kinds of operating states, promptly direct ground state, capacity earth state and protection operating state.
Direct ground state: by-pass switch QF is closed, and T1-T6 breaks off, and capacitor is by bypass, the direct ground connection of transformer neutral point.
The capacity earth state: by-pass switch QF breaks off, and T1-T6 breaks off, and transformer neutral point is through capacitor grounding, and device plays the effect that suppresses constant current.
Protection operating state: T1-T6 forces conducting, and QF is closed, and capacitor is by bypass, the direct ground connection of transformer neutral point.
Claims (2)
1. a transformer DC magnetic bias restraining device is characterized in that, it comprises the capacitor of one group of parallel connection, and a parallel connected end of capacitor group is connected with capacitance current instrument transformer ACTA2; Capacitance current instrument transformer ACTA2 is connected with DC current transformer DCTA, the by-pass switch current transformer ACTA1 of series connection;
Be parallel with voltage transformer TV1, TV2, discharging gap FD, bypass mechanical switch QF between by-pass switch current transformer ACTA1 and another parallel connected end of capacitor group, simultaneously bypass mechanical switch QF two ends also are parallel with reactor L1-L3 and the thyristor T1-T6 and the circuits for triggering thereof of the reverse parallel connection of connecting respectively with reactor L1-L3;
DC current transformer DCTA, by-pass switch current transformer ACTA1, voltage transformer TV1, TV2, thyristor T1-T6 circuits for triggering also are connected with the monitoring and protection unit.
2. transformer DC magnetic bias restraining device as claimed in claim 1; It is characterized in that; Said DC current transformer DCTA is connected with transformer neutral point earthed switch K1 one end; Parallel connected end of capacitor group is connected with transformer neutral point earthed switch K1 through device switching knife switch K2, and transformer neutral point earthed switch K1 is connected with transformer 220KV side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102158580A CN102709895A (en) | 2012-06-27 | 2012-06-27 | Transformer DC (Direct Current) bias magnetic suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102158580A CN102709895A (en) | 2012-06-27 | 2012-06-27 | Transformer DC (Direct Current) bias magnetic suppression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102709895A true CN102709895A (en) | 2012-10-03 |
Family
ID=46902513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102158580A Pending CN102709895A (en) | 2012-06-27 | 2012-06-27 | Transformer DC (Direct Current) bias magnetic suppression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102709895A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368155A (en) * | 2013-07-09 | 2013-10-23 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103439605A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Method for detecting transformer direct-current magnetic bias capacity |
| CN107453326A (en) * | 2017-08-23 | 2017-12-08 | 全球能源互联网研究院 | The protection device and micro-capacitance sensor of a kind of grounding transformer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1732201A2 (en) * | 2005-06-06 | 2006-12-13 | ABB Oy | Method and arrangement for charging capacitors of direct-voltage intermediate circuit of frequency converter |
| CN1967957A (en) * | 2006-11-24 | 2007-05-23 | 华中科技大学 | Direct current current-limiting device of neutral point of grounding transformer |
| CN201345536Y (en) * | 2009-01-22 | 2009-11-11 | 广东省电力工业局试验研究所 | Transformer neutral point capacitance-resistance mixed type inhibition direct current device |
| CN102347608A (en) * | 2011-09-08 | 2012-02-08 | 天津理工大学 | Thyristor switch protection-based transformer neutral point blocking system and working method thereof |
| CN202616762U (en) * | 2012-06-27 | 2012-12-19 | 山东电力集团公司电力科学研究院 | Direct current magnetic bias restraining device of transformer |
-
2012
- 2012-06-27 CN CN2012102158580A patent/CN102709895A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1732201A2 (en) * | 2005-06-06 | 2006-12-13 | ABB Oy | Method and arrangement for charging capacitors of direct-voltage intermediate circuit of frequency converter |
| CN1967957A (en) * | 2006-11-24 | 2007-05-23 | 华中科技大学 | Direct current current-limiting device of neutral point of grounding transformer |
| CN201345536Y (en) * | 2009-01-22 | 2009-11-11 | 广东省电力工业局试验研究所 | Transformer neutral point capacitance-resistance mixed type inhibition direct current device |
| CN102347608A (en) * | 2011-09-08 | 2012-02-08 | 天津理工大学 | Thyristor switch protection-based transformer neutral point blocking system and working method thereof |
| CN202616762U (en) * | 2012-06-27 | 2012-12-19 | 山东电力集团公司电力科学研究院 | Direct current magnetic bias restraining device of transformer |
Non-Patent Citations (1)
| Title |
|---|
| 李长云等: "基于双重保护拓扑的变压器直流偏磁抑制措施", 《电力自动化设备》, vol. 32, no. 1, 31 January 2012 (2012-01-31) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368155A (en) * | 2013-07-09 | 2013-10-23 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103368155B (en) * | 2013-07-09 | 2015-06-24 | 东北电力大学 | Capacitance DC (Direct Current) blocking on-off controllable bridge circuit for inhibiting DC magnetic bias of transformer |
| CN103439605A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Method for detecting transformer direct-current magnetic bias capacity |
| CN107453326A (en) * | 2017-08-23 | 2017-12-08 | 全球能源互联网研究院 | The protection device and micro-capacitance sensor of a kind of grounding transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3672008B1 (en) | Series compensator, and control method | |
| CN104821563A (en) | Zero-loss depth current-limiting protection device | |
| CN104767194B (en) | A kind of high voltage power transmission current conversion station over-pressure safety device | |
| CN110829393A (en) | Current-limiting hybrid direct-current circuit breaker with active protection function and control method | |
| CN103368168B (en) | The transformer DC magnetic bias restraining device of automatic switching and control method thereof | |
| CN106786403A (en) | A kind of DC solid circuit breaker with continuous current circuit | |
| CN103986342A (en) | Power electronic current converter and control method capable of eliminating two-way fault current | |
| CN205509513U (en) | Based on fast switch type cascade compensation device | |
| CN202616762U (en) | Direct current magnetic bias restraining device of transformer | |
| CN205509468U (en) | Collection flow box protection device | |
| CN105281341A (en) | High-voltage thyristor switching capacitor device and switching method | |
| CN102709895A (en) | Transformer DC (Direct Current) bias magnetic suppression device | |
| CN201008096Y (en) | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network | |
| CN107370130B (en) | A kind of hybrid high voltage DC breaker and its control strategy based on modified half-bridge submodule | |
| CN103326373B (en) | Control method of dynamic reactive power compensation device suitable for multi-direct-current feed-in power grid | |
| CN207625293U (en) | A kind of connection in series-parallel mixed type compensator | |
| CN203135401U (en) | AC invasion protection device for DC system of transformer substation | |
| CN104600722A (en) | Intelligent zero-crossing switching device for high-voltage shunt capacitors | |
| CN110556794B (en) | Bus bar protection configuration method of multi-end hybrid direct current system | |
| CN113852056A (en) | Economical direct current breaker with pre-current limiting function and control method thereof | |
| CN202798000U (en) | Static var generator (SVG) high voltage static reactive power compensation system | |
| CN111092416B (en) | High-voltage short-circuit current limiting device and control method | |
| CN109038595B (en) | Low-capacity/low-impedance flexible switching system and control method thereof | |
| CN203278252U (en) | Dynamic reactive power compensation device suitable for multi-direct-current feed-in power grid | |
| CN108075455B (en) | Current limiting blocking device and method for direct current power distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20120905 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20120905 Address after: 250002, No. 1, South Second Ring Road, Shizhong District, Shandong, Ji'nan Applicant after: Electric Power Research Institute of Shandong Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 250002, No. 1, South Second Ring Road, Shizhong District, Shandong, Ji'nan Applicant before: Electric Power Research Institute of Shandong Electric Power Corporation |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121003 |